Dr. Ahmed Mohamed Abu-Dief

Professor - Professor of Physical and Inorganic Chemistry

Faculty of science

Address: Behind hospital of Sohag University - Ali Ebn Abi Taleb Street



Publications Which contain the keyword: semiconductor

2019-10-02 07:52:16 Keywords photothermal waves, semiconductor,
A GN model on photothermal interactions in a two-dimensions semiconductor half space
The model of coupled plasma and thermo-elastic wave were used to investigate the wave propagation in a two-dimensional semiconducting half space by using eigenvalues approach. By using Fourier and Laplace transformations with the eigenvalues techniques methodology, the exact solution of all physical quantities is obtained. The boundary edge of the plane is due to a heat flux with a pulse ... Read more

2019-10-02 08:04:58 Keywords semiconductor, photothermal waves,
Two-Temperature Photothermal Interactions in a Semiconducting Material with a 3-D Spherical Cavity
In this paper, a two-temperatures photothermoelastic interactions in an infinite semiconductor medium with a spherical cavity were studied using mathematical methods. The cavity internal surface is traction free and the carrier density is photogenerated by boundary heat flux with an exponentially decaying pulse. Laplace transform techniques are used to obtain the exact solution of the problem in the transformed domain ... Read more

2019-10-02 08:19:50 Keywords semiconductor, photothermal waves,
Модель двухфазного сдвига фототермоупругих волн в двумерной полупроводниковой среде1
В статье с использованием обобщенной модели фототермической волны и модели двухфазного запаздывания проведены расчеты приращения температуры, компонент смещения, плотности носителей и компонент напряжений в двумерных полупроводниковых средах. С помощью преобразований Фурье и Лапласа в рамках подхода к определению собственных значений получены точные решения для всех физических величин. Исследование полупроводниковой среды проведено на примере кремния. С использованием полученных результатов проиллюстрирована разница ... Read more

2020-03-06 23:05:18 Keywords Metal oxide, Nanostructures, semiconductor,
Development of Metal Oxide Nanoparticles as Semiconductors
The physical and chemical properties of semiconductor materials change drastically when its size is reduced to nanoscale due to their large surface area or quantum size effect. Metal oxide (MOx) semiconducting nanostructures hold the potential for playing a critical role in the development of a new platform for renewable energies, including energy conversion and storage through photovoltaic effect, solar fuels, ... Read more

2018-12-05 15:29:24 Keywords Geometric Phase, semiconductor, Microcavities,
Engineering Geometric Phase in Semiconductor Microcavities
We present rigorous investigations of the geometric phase in semiconductor microcavities. The effects of excitonic spontaneous emission, initial state setting and cavity dissipation have been discussed. It is shown that the geometric phase decays exponentially due to the presence of excitonic spontaneous emission. More importantly, the inclusion of the phase shift leads to an enhanced sensitivity for the control of ... Read more

2018-10-26 17:31:48 Keywords eigenvalue approach, semiconductor, photo-thermoelastic,
Photo-thermoelastic interactions in a 2D semiconducting medium
Photo-thermoelastic interactions in a two-dimension semiconductor medium are studied by using mathematical methods in the context of coupled thermoelastic theory and plasma waves with one thermal relaxation time. The Laplace-Fourier transformations and eigenvalues approach are used to obtain the general solutions for any set of boundary conditions. The medium is initially assumed to be at rest and due to a ... Read more

2018-10-18 10:14:30 Keywords semiconductor, Two-temperature, cylindrical hole, photothermal,
A two-temperature photothermal interaction in a semiconductor medium containing a cylindrical hole
Photothermoelastic interactions in an infinite semiconductor medium containing a cylindrical hole with two temperatures are studied using mathematical method under the purview of the coupled theory of thermal, plasma and elastic waves. The internal surface of the hole is constrained and the carrier density is photogenerated by bound heat flux with an exponentially decaying pulse. Based on Laplace transform and ... Read more

2018-10-12 12:23:32 Keywords plasma, elastic waves, semiconductor,
A generalized model on plasma, thermal and elastic waves in a semiconductor medium
In this work, a generalized model on plasma, thermal and elastic waves was used to study the wave propagation of semiconducting material during the photo-thermal process. The thermal relaxation time, the coupling between the plasma, thermal, and elastic waves has been considered. The analytical solutions in the transformed domain by the eigenvalue approach have been obtained based on the techniques ... Read more

2018-10-13 22:34:41 Keywords semiconductor, Thermoelasticity, spherical cavity, DPL model,
A DPL model of photo-thermal interaction in an infinite semiconductor material containing a spherical hole
The dual phase lag (DPL) heat transfer model is applied to study the photo-thermal interaction in an infinite semiconductor medium containing a spherical hole. The inner surface of the cavity was traction free and loaded thermally by pulse heat flux. By using the eigenvalue approach methodology and Laplace’s transform, the physical variable solutions are obtained analytically. The numerical computations for ... Read more

2018-10-13 22:40:03 Keywords eigenvalue approach, Thermoelasticity, semiconductor,
Photo-thermal-elastic interaction in an unbounded semiconducting medium with spherical cavity due to pulse heat flux
In this work, the photothermal waves in an unbounded semiconducting medium with spherical cavity are studied. This problem is solved using the theory of coupled plasma, thermal, and elastic wave. An unbounded material, elastic semiconductor containing a spherical cavity with isotropic and homogeneous thermal and elastic properties has been considered. The inner surface of the cavity is taken traction-free and ... Read more